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Radiolaria.org (1792 words) |
 | The distribution of polycystine radiolarians in the world ocean is affected by a special set of ecological conditions, which characterize the water masses they live in. |
| The distribution patterns of polycystine radiolarians in the surface sediments of the world ocean may therefore be severely altered by intensive and even complete dissolution of the biogenic opal microfossils. |
| Polycystine radiolarians have therefore to be separated from the remaining plankton material by using a strong oxydizing agent or a low temperature asher where the organic material is being burned off. |
| Chapter 10.htm (4587 words) |
| The famous Polycystine marl of Barbados in the Antilles, which Robert Schomburgk discovered forty years ago, belongs to the Miocene formation, and is the richest and best known of all the important Radiolarian deposits (see L. 16, pp. |
| The Cainozoic Polycystine tripoli or marl of the Mediterranean coast, which is probably always of Miocene origin, forms very extensive mountain ranges both in the south of Europe (Sicily, Calabria, Greece) and in the north of Africa (from Oran to Tripoli) (§ 246). |
| To this category belong the pure Miocene Polycystine marls of Barbados (§ 246), the Tertiary Polycystine clay of the Nicobar Islands (§ 247), and the Polycystine quartz of the Jura (§ 248). |
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